Fireproof design method for aluminum alloy door rigid structure

Abstract

The invention relates to a fireproof design method for a steel structure of an aluminum alloy door, which belongs to the technical field of building construction, and comprises the following design steps: according to the fireproof design method for the steel structure of the aluminum alloy door, determining the component temperature of the component at the set fireproof time by using a fire simulation tool according to the distance between the aluminum alloy component and a fire source; s2, according to the component temperature in the step S1, performing a tensile test on the component test piece after heating to confirm a high-temperature material property value of the component; and based on the high-temperature material property value of the component obtained in the step S2, component strength and deformation checking is carried out through formula calculation. According to the method, the temperature of the component is determined through the FDS simulation tool according to the fire high-temperature load of the component when the distance between the aluminum alloy component and a fire source, and the high-temperature strength and the elastic modulus of the 7075-T6 aluminum alloy profile are measured through a high-temperature material property test; and whether the strength and deformation of the component at the high temperature meet the requirements or not is checked by introducing a high-temperature strength and elastic modulus calculation formula, and the fireproof design of the aluminum alloy door rigid structure is rapidly completed.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, specifically relating to a fireproof design method for a rigid structure of aluminum alloy doors. Background Technology

[0002] Since 1950, Europe and America have gradually applied aluminum alloy materials to large-span spatial structures, a development process that has spanned nearly a century. However, my country's development started later, with the first national standard, "Code for Design of Aluminum Alloy Structures" (GB50429-2007), not being implemented until 2007. Aluminum alloy portal frames are a spatial portal frame building structure system using aluminum alloy members as the main components. This type of structure has many advantages, including light weight, high strength, strong corrosion resistance, ease of processing, and rapid installation. Based on these advantages, aluminum alloy portal frames are widely used in the form of tents for industrial plants, temporary exhibitions, stadiums, and logistics warehousing projects.

[0003] Fire is one of the most dangerous and common building disasters. In 2018, 237,000 fires were reported nationwide, resulting in 1,407 deaths, 798 injuries, and direct property losses of 3.675 billion yuan. While research on the high-temperature performance of aluminum alloy structures is maturing internationally, domestic research on fire resistance testing of aluminum alloy structures is relatively limited. Current high-temperature testing of aluminum alloy structures mainly focuses on domestically produced 6061-T6 aluminum alloy materials for building applications, lacking fire protection regulations and design guidelines for high-strength aluminum alloy structures such as 7075-T6. To promote the application of 7075-T6 aluminum alloy in portal frame structures and expand their applicability, research on its fire resistance performance and fire protection design methods is necessary to provide a reliable basis for the design of such structures. Therefore, a fire protection design method for aluminum alloy portal frame structures is needed to address the problem of the lack of fire protection regulations and design guidelines for 7075-T6 high-strength aluminum alloy structures in existing technologies, which makes fire protection design of aluminum alloy portal frame structures difficult and results in low reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a fireproof design method for the rigid structure of aluminum alloy doors to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fireproof design method for a rigid structure of an aluminum alloy door, comprising the following design steps: S1. Based on the distance between the aluminum alloy component and the fire source, use fire simulation tools to determine the component temperature at the set fire protection time. S2. Based on the component temperature in S1, conduct a tensile test on the component specimen after heating to confirm the high-temperature material property values ​​of the component. S3. Based on the high-temperature material property values ​​of the component obtained in S2, the strength and deformation of the component are checked by using the formula.

[0006] As a preferred option, the aluminum alloy component is a 7075-T6 type aluminum alloy I-beam.

[0007] Preferably, in S1, the fire protection time is set to 0.5h or / and 1h.

[0008] Preferably, in S1, when determining the component temperature at a set fire resistance time using a fire simulation tool based on the distance between the aluminum alloy component and the fire source, the process includes the following steps: S10. Based on the position of the aluminum alloy components in the aluminum alloy door rigid structure, establish several sets of numerical models of the distance between the components and the fire source. S11. Using the numerical model established in S10, the FDS simulation tool is used to generate a component temperature lookup table for the set fire protection time. S12. Using the component temperature lookup table generated in S11, determine the component temperature of any component in the aluminum alloy door rigid structure at the set fire protection time.

[0009] Preferably, the distance between the aluminum alloy component and the fire source includes the horizontal distance between the component and the fire source and the vertical distance between the component and the fire source.

[0010] Preferably, in S12, for components whose location distance values ​​are not in the component temperature lookup table, the component temperature is determined by using linear interpolation in the component temperature lookup table.

[0011] Preferably, in step S2, when performing a tensile test on the component specimen after heating based on the component temperature in step S1 to confirm the high-temperature material property values ​​of the component, the following steps are included: S20. Establish component tensile test temperature groups: Based on the component temperature in S1, select several temperatures from the component temperature tables as component tensile test temperature groups. S21. Establish a high-temperature material property lookup table for components: Based on the component tensile test temperature group in S20, tensile tests are conducted on component specimens after heating them to the selected heating temperature to obtain the high-temperature material property values ​​of components at different temperatures. A high-temperature material property lookup table for components is established using several sets of component temperatures and high-temperature material property values. S22. Using the high-temperature material property lookup table of components generated in S21, determine the high-temperature material values ​​of aluminum alloy components at any temperature.

[0012] Preferably, for components whose temperature is not in the component high-temperature material property lookup table, the high-temperature material value of the component is determined by using linear interpolation in the component high-temperature material property lookup table.

[0013] Preferably, the high-temperature material properties include strength and elastic modulus.

[0014] As a preferred option, in S3, the formula is: In the formula: N This represents the design value of the axial force of the component. M The bending moment design value of the component. A Let be the cross-sectional area of ​​the component. W The section modulus of the component. I Let be the moment of inertia of the component section.

[0015] Beneficial effects: 1. The fireproof design method for aluminum alloy door steel structures of the present invention uses FDS simulation tools to determine the high-temperature fire load of the aluminum alloy component at the distance between it and the fire source, thereby determining the component temperature. High-temperature material property tests are used to measure the high-temperature strength and elastic modulus of the 7075-T6 aluminum alloy profile. The strength and deformation of the component at high temperatures are then verified by applying the high-temperature strength and elastic modulus calculation formulas to ensure that the requirements are met. This enables the rapid completion of fireproof design for 7075-T6 aluminum alloy door steel structures and ensures the reliability of the design results.

[0016] 2. Based on the foregoing, the fireproof design method for aluminum alloy door rigid structure of the present invention, when determining the component temperature at a set fireproof time using fire simulation tools based on the distance between the aluminum alloy component and the fire source, establishes a distance numerical model using the horizontal and vertical distances between the component and the fire source as an FDS simulation tool, so as to fully consider the influence of the distance between the component and the fire source, thereby making the design numerical reliability and achieving refined design.

[0017] 3. Based on the foregoing, the fireproof design method for the aluminum alloy door rigid structure of the present invention determines the component temperature at a set fire resistance time by using fire simulation tools based on the distance between the aluminum alloy component and the fire source, and confirms the design method according to the fire resistance requirements of the rigid structure, i.e., the fire resistance time, so as to achieve rapid design and precise control of the manufacturing cost of the rigid structure.

[0018] 4. Building upon the foregoing, the fire-resistant design method for rigid structures of aluminum alloy doors of the present invention establishes a component temperature lookup table and a component high-temperature material property lookup table based on the component temperature lookup table using FDS simulation tools. This provides data support for the fire-resistant design of rigid structures made of the same type of aluminum alloy components. For component location values ​​and component temperature values ​​not found in the component temperature lookup table or the component high-temperature material property lookup table, the corresponding values ​​are confirmed using linear interpolation in the corresponding lookup table, thereby improving the applicability and saving design time.

[0019] 5. Based on the foregoing, the fireproof design method for the aluminum alloy door rigid structure of the present invention verifies whether the strength and deformation of the components meet the requirements by calculating the high-temperature material properties of the components obtained from the query. The calculated values ​​include the axial force design value of the component, the bending moment design value of the component, the cross-sectional area of ​​the component, the section modulus of the component, and the moment of inertia of the component section, so as to ensure the reliability of the design results. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the aluminum alloy door frame structure in an embodiment. Figure 2 This is a schematic diagram of a numerical analysis model using the FDS simulation tool in the example.

[0021] In the diagram: 1. Fire source; 2. Aluminum alloy component. Detailed Implementation

[0022] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the embodiments. For clarity, the aluminum alloy steel structure of this embodiment is composed of 7075-T6 type aluminum alloy I-beam members, and the fire protection design method of this embodiment is applicable to temporary buildings without fire protection measures and with a fire protection time of 0.5h or 1h.

[0023] Please see Figures 1-2 This embodiment provides a fireproof design method for the rigid structure of aluminum alloy doors, including the following design steps: S1. Based on the distance between aluminum alloy component 2 and fire source 1, use fire simulation tools to determine the component temperature at the set fire protection time. S2. Based on the component temperature in S1, conduct a tensile test on the component specimen after heating to confirm the high-temperature material property values ​​of the component. S3. Based on the high-temperature material property values ​​of the component obtained in S2, the strength and deformation of the component are checked by using the formula.

[0024] The fire-resistant design method for aluminum alloy door rigid structures in this embodiment includes the following steps in S1: When determining the component temperature at a set fire resistance time using a fire simulation tool based on the distance between the aluminum alloy component and the fire source, the method includes the following steps: S10. Based on the position of the aluminum alloy components in the aluminum alloy door frame, establish several sets of numerical models of the distance between the components and the fire source; wherein, the distance between the aluminum alloy components and the fire source includes the horizontal distance between the components and the fire source and the vertical distance between the components and the fire source. In this embodiment, the distance between the components and the fire source is spaced at 1m intervals, and the numerical models of the distance are divided into 6 sets. S11. Using the numerical model established in S10, the component temperature lookup table is generated by calculation using the FDS simulation tool when the fire protection time is set. In this embodiment, the fire protection time is set to 0.5h or 1h. In the 6 sets of distance numerical models established in S10, two numerical models are established with 0.5h and 1h respectively. The component temperature lookup table is generated by calculation. Please refer to Table 1.

[0025]

[0026] S12. Using the component temperature lookup table generated in S11, determine the component temperature of any component in the aluminum alloy door rigid structure at the set fire protection time. For components whose location distance value is not in the component temperature lookup table, confirm the component temperature by using linear interpolation in the component temperature lookup table.

[0027] The fireproof design method for the aluminum alloy door rigid structure in this embodiment includes the following steps in S2: When performing a tensile test on the component specimen after heating based on the component temperature in S1 to confirm the high-temperature material properties of the component, the method comprises: S20. Establish component tensile test temperature group: Based on the component temperature in S1, select the temperatures in the 8 component temperature tables as the component tensile test temperature group; the 8 component temperature values ​​are 20℃, 100℃, 200℃, 250℃, 300℃, 350℃, 400℃ and 500℃ respectively.

[0028] S21. Establish a high-temperature material property lookup table for components: Based on the component tensile test temperature group in S20, the component specimen is heated to the selected heating temperature and then subjected to a tensile test to obtain the high-temperature material property values ​​of the component at different temperatures. The high-temperature material property values ​​in this embodiment include the component strength and the component elastic modulus values. A high-temperature material property lookup table for components is established with 8 groups of component temperatures and high-temperature material property values. Please refer to Table 2.

[0029]

[0030] S22. Using the high-temperature material property lookup table generated in S21, determine the high-temperature material values ​​of aluminum alloy components at any temperature. For components whose temperature is not in the high-temperature material property lookup table, confirm the high-temperature material values ​​of the components by using linear interpolation in the high-temperature material property lookup table.

[0031] When verifying the environmental indicators of sealing materials, the verification methods include: checking the factory test report of the environmentally friendly sealing materials, verifying that the volatile organic compound (VOC) content in the environmentally friendly sealing materials is ≤100g / L, and that no harmful substances including formaldehyde and benzene series are detected. The environmentally friendly sealing materials must comply with the "Sealants for Building Use" (GB / T14683) and the green building evaluation standards. In this embodiment, the glass curtain wall waterproofing and sealing method based on environmentally friendly sealing materials, in step S3, uses the following formula to calculate and verify the strength and deformation of the components: In the formula: N This represents the design value of the axial force of the component. M The bending moment design value of the component. A Let be the cross-sectional area of ​​the component. W The section modulus of the component. I Let be the moment of inertia of the component section.

[0032] This embodiment of the fire-resistant design method for aluminum alloy door steel structures uses the FDS simulation tool to determine the high-temperature fire load on the aluminum alloy components at the distance between them and the fire source, thereby determining the component temperature. High-temperature material property tests are conducted to measure the high-temperature strength and modulus of elasticity of the 7075-T6 aluminum alloy profiles. The strength and deformation of the components at high temperatures are then verified using the high-temperature strength and modulus of elasticity calculation formulas to ensure they meet the requirements. This method enables the rapid completion of fire-resistant design for 7075-T6 aluminum alloy door steel structures and guarantees the reliability of the design results.

[0033] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A method for fire design of an aluminum alloy door frame structure, characterized by, The method comprises the following design steps: S1, determining the component temperature of the component at a set fireproof time according to the distance between the aluminum alloy component and the fire source by using a fire simulation tool; S2, performing a tensile test on the component specimen after heating to confirm the high-temperature material property value of the component according to the component temperature in S1; S3, performing component strength and deformation checking by formula calculation based on the high-temperature material property value of the component obtained in S2.

2. The method of fire design of an aluminum alloy door frame structure according to claim 1, wherein The aluminum alloy component is a 7075-T6 type aluminum alloy I-shaped bar.

3. The fireproof design method for the rigid structure of an aluminum alloy door according to claim 1, characterized in that, In S1, the set fireproof time is 0.5h or / and 1h.

4. The method of claim 1, wherein, In S1, when the component temperature of the component at a set fireproof time is determined according to the distance between the aluminum alloy component and the fire source by using a fire simulation tool, the following steps are included: S10, establishing a plurality of distance value models between the component and the fire source according to the position of the aluminum alloy component in the aluminum alloy portal frame structure; S11, generating a component temperature query table of the component at a set fireproof time by calculation by using the numerical model established in S10 by using the FDS simulation tool; S12, determining the component temperature of the component at a set fireproof time at any position of the aluminum alloy portal frame structure by using the component temperature query table generated in S11.

5. The method of claim 1, wherein, The distance between the aluminum alloy component and the fire source includes the horizontal distance between the component and the fire source and the vertical distance between the component and the fire source.

6. The method of fire design of aluminum alloy door frame structure according to claim 4, characterized in that, In S12, for the component whose position distance value is not in the component temperature query table, the component temperature is confirmed by using a linear interpolation method in the component temperature query table.

7. The method of claim 1, wherein the aluminum alloy door frame is designed to resist fire. In S2, when the tensile test on the component specimen after heating is performed to confirm the high-temperature material property value of the component according to the component temperature in S1, the following steps are included: S20, establishing a component tensile test temperature group: selecting a plurality of temperatures in the component temperature table as the component tensile test temperature group according to the component temperature in S1; S21, establishing a component high-temperature material property query table: based on the component tensile test temperature group in S20, performing a tensile test on the component specimen after heating to the selected heating temperature to obtain the high-temperature material property value of the component at different temperatures, and establishing a component high-temperature material property query table with a plurality of component temperatures and high-temperature material property values; S22, determining the high-temperature material value of the aluminum alloy component at any temperature by using the component high-temperature material property query table generated in S21.

8. The method of claim 7, wherein the aluminum alloy door frame is designed to be fire resistant. For the component whose temperature is not in the component high-temperature material property query table, the high-temperature material value of the component is confirmed by using a linear interpolation method in the component high-temperature material property query table.

9. A fireproof design method for a rigid structure of an aluminum alloy door according to claim 1, characterized in that, The high-temperature material property value includes the strength value and the elastic modulus value.

10. The method of claim 1, wherein the aluminum alloy door frame is designed to resist fire. In S3, the formula is: ; ; wherein: N is the axial force design value of the member, M is the bending moment design value of the member, A is the cross-sectional area of the member, W is the cross-sectional modulus of the member, I is the cross-sectional moment of inertia of the member, is the strength of the member, is the elastic modulus of the member.

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